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Referencias:

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• The α and β descriptors were employed to indicate that the addition of the diene to the (2S)-dihydropyranone ring took place from the opposite (α) or the same side (β) respect to the 2-alkoxy substituent; note; note; Fratiello, A., Schuster, R.E., (1972) J. Org. Chem., 37, pp. 2237-2241
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• 1a with Lewis acids: for the 1H NMR experiments, the dihydropyranone 1a (10 mg) was dissolved in CDCl3 (0.6 mL) in a NMR tube and cooled to -78°C. The number of molar equivalents of the Lewis acid indicated in Table 2 were added. The solution was stirred and allowed to reach room temperature to register the spectrum. Compound 1a was stable at temperatures between -20 and 20°C, for times longer than those required for the acquisition of the spectrum; Halpern, Y., Riffer, R., Broido, A., (1973) J. Org. Chem., 38, pp. 204-209
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